That one veterinarian is very well respected within the canine community. She also linked to numerous studies that her opinion is based upon. Your behavior issues - marking territory and roaming in search of a mate - are not really problems in any way. First off, my male (intact or not) is going to hit every tree he possibly can. To be honest I want hm marking up the neighbourhood. Years ago, I had a spayed Boxer ***** that would back her ass up to a tree, hoist herself up onto her front legs and spray as high up as she could. No dogs screwed with her. If you're talking about marking inside you have bigger problems than the dog's balls. Roaming (and unwanted litters) are always brought up by the advocates of early spay/neuter, but long gone are the days when you would open your front door in the morning and kick your dog out for the day. I don't know about your town but I never see unattended dogs or packs anymore. The odds of your amorous dog escaping and finding a ***** in heat are pretty much nil. As to aggression, I just don't see it after a lot of hands-on experience with biting dogs. Aggression (and indiscriminate biting) in dogs is rarely understood correctly. My guess is that if you're noticed a difference in a pre and altered dogs it has more to do with maturity and training than testosterone. Lopping off a dog's testicles to prevent testicular cancer is an interesting approach to health care. lefty